SP3222EB datasheet(14/20 Pages) SIPEX

部品番号	SP3222EB

部品情報	True 3.0V to 5.5V RS-232 Transceivers

PDF	20 Pages

Scroll/Zoom	100%

メーカー	SIPEX [Sipex Corporation]

ホームページ	http://www.sipex.com

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14 / 20 page

Rev. A Date:12/11/03

SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers

Figure 20. ESD Test Waveform for IEC1000-4-2

30A

15A

t=30ns

t ➙

t=0ns

Device Pin

Human Body

IEC1000-4-2

Tested

Model

Air Discharge

Direct Contact

Level

Driver Outputs

±15kV

±8kV

Receiver Inputs

±15kV

±8kV

Table 3. Transceiver ESD Tolerance Levels

For the Human Body Model, the current

limiting resistor (R

S) and the source capacitor

S) are 1.5kΩ an 100pF, respectively. For

IEC-1000-4-2, the current limiting resistor (R

and the source capacitor (C

S) are 330Ω an

150pF, respectively.

The higher C

S value and

lower R

S value in the

IEC1000-4-2 model are more stringent than the

Human Body Model. The larger storage capacitor

injects a higher voltage to the test point when SW2

is switched on. The lower current limiting resistor

increases the current charge onto the test point.

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